Jack for portable hoists.



H. A. RUDD & F. B. COLLINS.

JACK FOR PORTABLE HOISTS.

APPLICATION FILED NOV. 7, 1911.

1 1 09,1 48, Pa tented Sept. '1, 1914.

THE NORRIS PETERS PHOTO-LITHO.. WASHINcmN. 04 C an STATES PATENT OFFICE.

HENRY A, RUDD. Ann FRA KB; ooLnr-Ns, or nnnnnnron, 01110, assrornons 'ro THE UDIAMOND MATCH ooMrANY, Or onoaeo, mun-oxen oonronA'rron ori LrnoIs;

men roia BORTQXBLEHOISTS, 7,

Meshes;

Specification 6f Letters Patent.

Patented sent. 1,1914.

, Application filed meats 7, 19.11. Seria-1No;.6r58,&4-7, I

To all whom it'may concern:

Be it known that we, HENRY A. RUDD; and FRANK B. COLLINS, citizens of the United States, and residents of Barberton, the county of Summit and State of Ohio, have invented certain new and useful Improve,

ments in Jacks for Portable Hoists, of-which the following is a specification.

The present invention relates to acks for portable hoisting apparatus and more especially to jacks for supporting the tackle blocks of lumber pilers.

The object of our invention is to provide a structure which combines the merits of lightness, strength and efficiency, and which, when not in actual service, may be readily folded into small compass for-convenience of packing and transportation.

Accordingly our invention comprises a jack structure embodying novel features of construction which will be hereinafter clescribed and claimed.

The invention also comprises features of construction which will be hereinafter described and claimed.

In the drawings Figure 1 is a side elevation of a jack embodying an efiicient form of our invention, the structure being represented as operatively mounted on a lumber pile and supporting a tackle block, and the parts as partially folded or collapsed being indicated by dotted lines. Fig. 2 is a plan of the jack with the tackle block omitted, the dotted lines showing the parts as in folded position.

A, B designate two frame sections so constructed. and interj ointed that one section can be folded upon or within the other. These sections are preferably of substantially triangular form with their basal ends jointed or pivotally connected, one of the sections, as A, constituting a supporting element for the structure and the other, as B, a derricklike arm or boom for the suspension of a tackle block or blocks, as C.

The members of the triangles are preferably composed of pipe bars as illustrated; the section A comprising two converging side bars 1, which are united at their apex by a bolt 2, and a basal bar 8 which is conveniently fastened to the spaced ends of the side bars by a through bolt 4, and the section B comprising two converging side bars 5 which are also united at their ends by a bolt 6 and are pivotally supported and jointed at their spaced ends to the section A by the connecting boltv 4:. v @nthe; apex bolts are joint members comprising pivoted angle pieces 7,8 respectively,

having inwardly extending arms which are cornected by a tie or, tension member ,9.

;' Preferably this member 9 comprises two sec tions jointed together as at 10, and attached at their extremities to the respective arms by links 11. The downwardly extending arms of the angle pieces 7, 8 have provisions, such i as perforations, for the attachment of hooks, or the llke, whereby an anchoring means,

such as the chain, 12, can be secured at the apex of the section A, and a tackle block, as

C, can be suspended from the apex of the section B, as illustrated.

The jointed skeleton-like structure above described combines lightness and'strength with simplicity of construction and operation. It may be readily erected in folded condltion upon a suitable support, as, for

example, a lumber pile adjoining one that is being built up, the section A being of sufficient length to project to or beyond the sides of the supporting structure. A chain, or the like, is hooked into the eye of the angle piece of the section B. The latter secto the ground or other stable body; and a tackle block is hooked into the eye of the angle piece of the section B. The latter section is then opened out to project the tackle block forwardly and upwardly beyond the lumber pile, and thus, similarly toa boom,

support the block in position for eflicient operation with or lift.

It is to be noted that when the section B is projected as just mentioned it is held in pothe tackle of a lumber sling sition for efiicient service by the tie-rod and chain connections, and yet, as indicated by the dotted lines, this section and the tie-rod, when the structure is free from a load, may be readily collapsed and folded into the section A for convenience of packing and transportation.

We claim 1. In a folding jack for portable hoists, two pivotally connected skeleton sections,

whereof one constitutes a base portion and the other a tackle supporting portion, said sections being so constructed and interjointed that one may be folded upon or within the other, a tie-connection for the said sections comprising a plurality of rods 11% and joint members between the outer extremities of said rods and the respective sections, whereby the said rods may be opened out or folded with the said sections, anchor means pivotally connected with the joint member of the base portion, and tackle means pivotally connected with the other joint member.

2. In a folding jack for portable hoists,

two triangular frame sections pivotally connected at their Wider or basal ends, angle pieces pivotally connected to the apices of said sections,-a tie-connection for the said sections comprising a plurality of rods which mit and State of Ohio this 3rd day of November 1911.

HENRY A. RUDD. FRANK B. COLLINS.

- Witnesses:

E. A. J 110033, E. J. MOLYNEAUX.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents,

A Washington, D. C. i 

